perf evlist: Return the first evsel with an invalid filter in apply_filters()

Use of a bad filter currently generates the message:
 Error: failed to set filter with 22 (Invalid argument)

Add the event name to make it clear to which event the filter
failed to apply:
  Error: Failed to set filter "foo" on event sched:sg_lb_stats: 22: Invalid argument

To test it use something like:

 # perf record -e sched:sched_switch -e sched:*fork --filter parent_pid==1 -e sched:*wait* --filter bla usleep 1
  Error: failed to set filter "bla" on event sched:sched_stat_iowait with 22 (Invalid argument)
 #

Based-on-a-patch-by: David Ahern <dsahern@gmail.com>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-d7gq2fjvaecozp9o2i0siifu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 11 insertions, 7 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5a2ff510b75b..18aad239b401 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -161,8 +161,9 @@ try_again:
                 }
         }
 
-        if (perf_evlist__apply_filters(evlist)) {
-                error("failed to set filter with %d (%s)\n", errno,
+        if (perf_evlist__apply_filters(evlist, &pos)) {
+                error("failed to set filter \"%s\" on event %s with %d (%s)\n",
+                        pos->filter, perf_evsel__name(pos), errno,
                         strerror_r(errno, msg, sizeof(msg)));
                 rc = -1;
                 goto out;
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index d4d1b77da0bd..f7b8218785f6 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -684,8 +684,9 @@ static int __run_perf_stat(int argc, const char **argv)
                         unit_width = l;
         }
 
-        if (perf_evlist__apply_filters(evsel_list)) {
-                error("failed to set filter with %d (%s)\n", errno,
+        if (perf_evlist__apply_filters(evsel_list, &counter)) {
+                error("failed to set filter \"%s\" on event %s with %d (%s)\n",
+                        counter->filter, perf_evsel__name(counter), errno,
                         strerror_r(errno, msg, sizeof(msg)));
                 return -1;
         }
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 8d0b62361129..82bf224bbee9 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1050,7 +1050,7 @@ out_delete_threads:
         return -1;
 }
 
-int perf_evlist__apply_filters(struct perf_evlist *evlist)
+int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel)
 {
         struct perf_evsel *evsel;
         int err = 0;
@@ -1062,8 +1062,10 @@ int perf_evlist__apply_filters(struct perf_evlist *evlist)
                         continue;
 
                 err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
-                if (err)
+                if (err) {
+                        *err_evsel = evsel;
                         break;
+                }
         }
 
         return err;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index f07c984465f0..fb19c47b8aac 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -152,7 +152,7 @@ static inline void perf_evlist__set_maps(struct perf_evlist *evlist,
 }
 
 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target);
-int perf_evlist__apply_filters(struct perf_evlist *evlist);
+int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **err_evsel);
 
 void __perf_evlist__set_leader(struct list_head *list);
 void perf_evlist__set_leader(struct perf_evlist *evlist);